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Stars are very large bodies in space generally made of mostly hydrogen. Their size can vary greatly but the smallest a star can be is loosely around 80 x the mass of jupiter well the largest stars can be billons time sthe size of the sun

Defanion of a star needs

You have to be above a certain size to be a star which is why gas giants like jupiter aren't stars.
They need to be big enough to not only start but maintain a stable fusion reaction. A brown dwarf is just below this
size as when they are first created they have fusion reaction but is quickly fizzles out and is therefore not a star. Stars
only stop fusion when they die resulting in a white dwarf, a neutron star or a black hole. (see more on page two)

What is a black hole?

Technical, anything with mass can become black hole if it is crushed into a small enough volume. This volume
differs depending mainly on how much mass the object has. Shrinking anything down to this size
concentrates its mass and creates huge gravitational forces, to the point where the normal laws of physics no longer behave as we expect them to in the universe we usually experience. (see more on
page three).